Best "Cracking/Hacking" OS?

I've been looking into "cracking/hacking" and I've been stumbling around some highly regarded Linux-based OS's like Backtrack 5 and Backbox. I'm new to this type of thing and just want to get started with it. For nothing bad but hardware is kinda getting boring, just looking for something new. If you guys could help me out getting something user friendly and simple, it would be great. Thanks guys.